Debt (Narrative) (Details)	3 Months Ended
	Apr. 30, 2022 USD ($)	Oct. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Aug. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Apr. 15, 2022 USD ($)	Dec. 07, 2021	Sep. 28, 2021
Line of Credit Facility [Line Items]
Line of credit facility, maximum amount outstanding during period	$ 3,000,000
Line Of Credit Facility, Borrowing Capacity, Term	$ 15,000,000
Line of credit facility, period for reduced borrowings during fourth quarter of each fiscal year (consecutive days)	30 days
Unused portion fee rate	0.375%
Inventory [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	60.00%
Inventories [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	85.00%
Maximum [Member] | Accounts receivable [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	85.00%
Amendment No. 21 To Credit Facility [Member] | Consecutive Four Fiscal Quarters Ending July 31, 2020
Line of Credit Facility [Line Items]
Minimum fixed charge coverage ratio								1.2
Amended And Restated Revolving Credit And Security Agreement, Number 2
Line of Credit Facility [Line Items]
Extension fee						$ 250,000
Waiver and amendment fee						75,000
Extension fee and waiver and amendment fee due at closing						200,000
Extension fee and waiver and amendment fee due at first anniversary of closing						$ 125,000
Amended And Restated Revolving Credit And Security Agreement, Number 2 | Consecutive Four Fiscal Quarters Ending July 31, 2020
Line of Credit Facility [Line Items]
Minimum fixed charge coverage ratio							1.00
Revolving Credit Facility [Member] | Amended And Restated Revolving Credit And Security Agreement, Number 2 | Forecast
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 45,000,000	$ 40,000,000	$ 70,000,000	$ 65,000,000
PNC [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Remaining borrowing capacity	$ 11,699,000
PNC [Member] | Revolving Credit Facility [Member] | Amendment No. 19 to Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	65,000,000
PNC [Member] | Equipment Loan [Member] | Amendment No. 19 to Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000,000
Alternate Base Rate Loans [Member]
Line of Credit Facility [Line Items]
Interest rate	5.25%